EP0549452B1 - Toothed wheel for a magnetic wheel speed sensor - Google Patents
Toothed wheel for a magnetic wheel speed sensor Download PDFInfo
- Publication number
- EP0549452B1 EP0549452B1 EP19920403506 EP92403506A EP0549452B1 EP 0549452 B1 EP0549452 B1 EP 0549452B1 EP 19920403506 EP19920403506 EP 19920403506 EP 92403506 A EP92403506 A EP 92403506A EP 0549452 B1 EP0549452 B1 EP 0549452B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crown
- magnetic
- ring
- wheel
- teeth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
Definitions
- the present invention essentially relates to a ring gear for magnetic speed sensor.
- magnetic sensors are generally used which are fixedly mounted on each wheel support and which use information from a magnetic field which varies with the frequency of the passage of the teeth of a toothed crown secured to the wheel of the vehicle.
- ABS system anti-blocking safety system
- EP-A-213,732 discloses a ring gear of the type described in the preamble of claim 1.
- the object of the present invention is to propose an improved toothed crown which overcomes the above drawbacks and advantageously avoids any risk of damage to the magnetic sensors and of failure of the anti-wheel lock systems when braking.
- the subject of the invention is a ring gear for a magnetic speed sensor intended in particular detecting the speed of rotation of a vehicle wheel with which an anti-lock system is associated, and of the type constituted by a crown capable of fitting said wheel and comprising a peripheral external toothing, the recesses between the teeth of the crown being filled with non-magnetic plastic elements constituting extensions, parallel to the axis of the crown, to a non-magnetic plastic ring, characterized in that the non-magnetic plastic ring surrounding the crown which is metallic, and making with its extensions and with the tops of the teeth of the crown, a cylindrical peripheral surface is housed in a recess of said crown, which recess is juxtaposed with the teeth of the crown in the axial direction.
- Figure 1 is an external plan view of a ring gear according to this invention.
- Figure 2 is an enlarged sectional view of the arrowed part II in Figure 1, of this crown.
- Figure 3 is a sectional view along line III-III of Figure 1.
- a ring gear sometimes called a phonic wheel, made for example of steel, which can be fitted to a vehicle wheel (not shown), and comprising a peripheral external toothing 1.
- the teeth 2 of the toothing 1 define between them recesses 3 which are filled with a non-magnetic material forming with the vertices 2a of the teeth 2 a cylindrical peripheral surface S, as can be seen in FIG. 2 .
- Such a cylindrical peripheral surface S can be obtained by machining the crown after filling the recesses 3 receiving the non-magnetic material forming a plurality of elements 4 housed in said recesses between the teeth 2.
- the recesses 3 are preferably filled with a plastic material, such as resin for example, which can be overmolded on the teeth 1 of the crown.
- the elements 4 of plastic material form extensions, parallel to the axis XX ′ of the crown, to a ring 5, also of plastic material surrounding said crown.
- the connection of the plastic elements 4 to the ring 5 makes it possible to obtain good cohesion between the different plastic elements 4.
- the ring 5 is housed or molded into a recess or a groove 6 juxtaposed to the teeth 1 in the axial direction. So, as always seen in Figure 3, the peripheral surface 5a of the ring 5 is located in the extension of the peripheral cylindrical surface of the teeth 1 to hollow 3 filled with plastic.
- the crown After overmolding of the plastic material on the peripheral surface of the steel crown, and which fills the recesses 3 as well as the recess 6, the crown can be machined, as mentioned above, so as to present a perfect cylindrical external surface, well that such machining is not compulsory, the crown, in this case, leaving the mold directly to the dimension.
- a very compact improved toothed crown has therefore been produced according to the invention, which can be manufactured from current steel crowns, having no visible tooth and making it possible to ensure the non-deterioration of the magnetic sensor with which it is associated.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
La présente invention a essentiellement pour objet une couronne dentée pour capteur magnétique de vitesse.The present invention essentially relates to a ring gear for magnetic speed sensor.
On sait que lorsqu'une roue de véhicule est équipée d'un système d'anti-blocage au freinage, il convient de détecter la vitesse de rotation de la roue.It is known that when a vehicle wheel is equipped with an anti-lock braking system, it is necessary to detect the speed of rotation of the wheel.
Pour ce faire, on utilise généralement des capteurs magnétiques montés fixes sur chaque support de roue et qui utilisent l'information issue d'un champ magnétique qui varie avec la fréquence de passage des dents d'une couronne dentée solidaire de la roue du véhicule.To do this, magnetic sensors are generally used which are fixedly mounted on each wheel support and which use information from a magnetic field which varies with the frequency of the passage of the teeth of a toothed crown secured to the wheel of the vehicle.
Cependant, en raison de la position des roues dans les passages de roue du véhicule, les couronnes dentées en question sont vulnérables aux projections de cailloux ou autres corps étrangers pouvant heurter accidentellement la denture de la couronne et même rester coincés entre deux dents. Dès lors, ces cailloux ou corps étrangers peuvent détériorer le capteur au cours de la rotation et par conséquent entraîner une défaillance du système anti-blocage de sécurité, généralement appelé système ABS.However, due to the position of the wheels in the wheel arches of the vehicle, the toothed crowns in question are vulnerable to projections of stones or other foreign bodies which can accidentally strike the teeth of the crown and even remain trapped between two teeth. Consequently, these stones or foreign bodies can deteriorate the sensor during rotation and consequently cause a failure of the anti-blocking safety system, generally called ABS system.
On connaît d'après le document EP-A-213.732 une couronne dentée du type décrit dans le préambule de la revendication 1.EP-A-213,732 discloses a ring gear of the type described in the preamble of claim 1.
La présente invention a pour but de proposer une couronne dentée perfectionnée qui remédie aux inconvénients ci-dessus et évite avantageusement tout risque d'endommagement des capteurs magnétiques et de défaillance des systèmes anti-blocage de roue au freinage.The object of the present invention is to propose an improved toothed crown which overcomes the above drawbacks and advantageously avoids any risk of damage to the magnetic sensors and of failure of the anti-wheel lock systems when braking.
A cet effet, l'invention a pour objet une couronne dentée pour capteur magnétique de vitesse destiné en particulier à détecter la vitesse de rotation d'une roue de véhicule à laquelle est associé un système d'anti-blocage, et du type constitué par une couronne pouvant équiper ladite roue et comportant une denture extérieure périphérique, les creux entre les dents de la couronne étant remplis par des éléments de matière plastique amagnétique constituant des extensions, parallèles à l'axe de la couronne, à un anneau en matière plastique amagnétique, caractérisée en ce que l'anneau en matière plastique amagnétique entourant la couronne qui est métallique, et réalisant avec ses extensions et avec les sommets des dents de la couronne une surface périphérique cylindrique, est logé dans un décrochement de ladite couronne, lequel décrochement est juxtaposé à la denture de la couronne dans le sens axial.To this end, the subject of the invention is a ring gear for a magnetic speed sensor intended in particular detecting the speed of rotation of a vehicle wheel with which an anti-lock system is associated, and of the type constituted by a crown capable of fitting said wheel and comprising a peripheral external toothing, the recesses between the teeth of the crown being filled with non-magnetic plastic elements constituting extensions, parallel to the axis of the crown, to a non-magnetic plastic ring, characterized in that the non-magnetic plastic ring surrounding the crown which is metallic, and making with its extensions and with the tops of the teeth of the crown, a cylindrical peripheral surface is housed in a recess of said crown, which recess is juxtaposed with the teeth of the crown in the axial direction.
Mais d'autres caractéristiques et avantages de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés, donnés uniquement à titre d'exemple, et dans lesquels.However, other characteristics and advantages of the invention will appear better in the detailed description which follows and which refers to the appended drawings, given solely by way of example, and in which.
La figure 1 est une vue extérieure et en plan d'une couronne dentée selon cette invention.Figure 1 is an external plan view of a ring gear according to this invention.
La figure 2 est une vue agrandie et en coupe de la partie fléchée II sur la figure 1, de cette couronne.Figure 2 is an enlarged sectional view of the arrowed part II in Figure 1, of this crown.
La figure 3 est une vue en coupe suivant la ligne III-III de la figure 1.Figure 3 is a sectional view along line III-III of Figure 1.
En se reportant notamment aux figures 1 et 3, on voit une couronne dentée, appelée parfois roue phonique, réalisée par exemple en acier, pouvant équiper une roue de véhicule (non représentée), et comportant une denture extérieure périphérique 1.Referring in particular to FIGS. 1 and 3, we see a ring gear, sometimes called a phonic wheel, made for example of steel, which can be fitted to a vehicle wheel (not shown), and comprising a peripheral external toothing 1.
Conformément à l'invention, les dents 2 de la denture 1 définissent entre elles des creux 3 qui sont remplis d'un matériau amagnétique réalisant avec les sommets 2a des dents 2 une surface périphérique cylindrique S, comme on le voit bien sur la figure 2.According to the invention, the
Une telle surface périphérique cylindrique S pourra être obtenue par usinage de la couronne après remplissage des creux 3 recevant le matériau amagnétique formant une pluralité d'éléments 4 logés dans lesdits creux entre les dents 2.Such a cylindrical peripheral surface S can be obtained by machining the crown after filling the
Les creux 3 sont de préférence remplis d'une matière plastique, telle que résine par exemple, qui peut être surmoulée sur la denture 1 de la couronne.The
Comme il apparaît clairement sur la figure 3, les éléments 4 en matière plastique forment des extensions, parallèles à l'axe X-X' de la couronne, à un anneau 5, lui aussi en matière plastique entourant ladite couronne. La liaison des éléments en matière plastique 4 à l'anneau 5 permet d'obtenir une bonne cohésion entre les différents éléments en matière plastique 4.As it clearly appears in FIG. 3, the elements 4 of plastic material form extensions, parallel to the axis XX ′ of the crown, to a ring 5, also of plastic material surrounding said crown. The connection of the plastic elements 4 to the ring 5 makes it possible to obtain good cohesion between the different plastic elements 4.
On voit sur la figure 3 que l'anneau 5 est logé ou surmoulé dans un décrochement ou une rainure 6 juxtaposée à la denture 1 dans le sens axial. Ainsi, comme on le voit toujours sur la figure 3, la surface périphérique 5a de l'anneau 5 se trouve dans le prolongement de la surface cylindrique périphérique de la denture 1 à creux 3 remplis de matière plastique.We see in Figure 3 that the ring 5 is housed or molded into a recess or a groove 6 juxtaposed to the teeth 1 in the axial direction. So, as always seen in Figure 3, the peripheral surface 5a of the ring 5 is located in the extension of the peripheral cylindrical surface of the teeth 1 to hollow 3 filled with plastic.
Après surmoulage de la matière plastique sur la surface périphérique de la couronne en acier, et qui remplit les creux 3 de même que le décrochement 6, la couronne pourra être usinée, comme évoqué précédemment, de façon à présenter une surface externe cylindrique parfaite, bien qu'un tel usinage ne soit pas obligatoire, la couronne, dans ce cas, sortant du moule directement à la cote.After overmolding of the plastic material on the peripheral surface of the steel crown, and which fills the
On a donc réalisé suivant l'invention une couronne dentée perfectionnée très compacte, pouvant être fabriquée à partir des couronnes actuelles en acier, ne présentant aucune dent apparente et permettant d'assurer la non détérioration du capteur magnétique auquel elle est associée.A very compact improved toothed crown has therefore been produced according to the invention, which can be manufactured from current steel crowns, having no visible tooth and making it possible to ensure the non-deterioration of the magnetic sensor with which it is associated.
Claims (2)
- Crown gear for magnetic speed sensor intended in particular to detect the speed of rotation of a vehicle wheel with which is associated an antiblocking system and of the type constituted by a ring which may fit the said wheel and comprising an external peripheral toothing (1), the hollows (3) between the teeth (2) of the ring being filled with elements (4) of non-magnetic plastics material constituting extensions parallel to the axis (X-X') of the crown, with a ring (5) of non-magnetic plastics material, characterized in that the ring (5) of non-magnetic plastics material surrounding the crown which is metallic and providing with its extensions and with the tips (2a) of the teeth (2) of the crown, a cylindrical peripheral surface (S), is accommodated in a rabbet (6) of the said crown, which rabbet is juxtaposed to the toothing (1) of the crown in the axial direction.
- Vehicle wheel fitted with a crown according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9116048 | 1991-12-23 | ||
| FR9116048A FR2685484B1 (en) | 1991-12-23 | 1991-12-23 | TOOTHED CROWN FOR MAGNETIC SPEED SENSOR AND VEHICLE WHEEL EQUIPPED WITH THIS CROWN. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0549452A1 EP0549452A1 (en) | 1993-06-30 |
| EP0549452B1 true EP0549452B1 (en) | 1996-05-22 |
Family
ID=9420417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920403506 Expired - Lifetime EP0549452B1 (en) | 1991-12-23 | 1992-12-21 | Toothed wheel for a magnetic wheel speed sensor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0549452B1 (en) |
| DE (1) | DE69210976T2 (en) |
| FR (1) | FR2685484B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009126126A1 (en) | 2008-04-10 | 2009-10-15 | Deere & Company | Motor shaft speed sensor arrangement |
| US9952248B2 (en) * | 2015-10-14 | 2018-04-24 | Danfoss Power Solutions G.m.b.H. & Co. OHG | Speed sensor ring |
| FR3065267A1 (en) * | 2017-04-18 | 2018-10-19 | Airbus Helicopters | GEARED GEAR WHEEL, GEAR DEVICE, POWER TRANSMISSION BOX AND AIRCRAFT HAVING A ROTATING VESSEL |
| US10837510B2 (en) * | 2018-04-10 | 2020-11-17 | Bendix Spicer Foundation Brake Llc | Thermally isolated composite exciter ring |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4161120A (en) * | 1978-05-08 | 1979-07-17 | Wabco Westinghouse | Equipment for the detection of rotation parameters in particular for a wheel-velocity sensor |
| JPS6225267A (en) * | 1985-07-26 | 1987-02-03 | Honda Motor Co Ltd | Magnetic signal generation ring |
| DE3735070A1 (en) * | 1987-10-16 | 1989-04-27 | Kugelfischer G Schaefer & Co | ROLLER BEARING WITH IMPULSE RING FOR SPEED MEASUREMENT |
| CA1333964C (en) * | 1988-08-24 | 1995-01-17 | David E. Peck | Unitary rotational speed sensor |
| IT1233900B (en) * | 1989-09-28 | 1992-04-21 | Riv Officine Di Villar Perosa | PHONIC WHEEL FOR DETECTION OF THE SPEED OF A ROTATING BODY, COATED WITH ELASTOMERIC MATERIAL |
-
1991
- 1991-12-23 FR FR9116048A patent/FR2685484B1/en not_active Expired - Fee Related
-
1992
- 1992-12-21 DE DE1992610976 patent/DE69210976T2/en not_active Expired - Fee Related
- 1992-12-21 EP EP19920403506 patent/EP0549452B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0549452A1 (en) | 1993-06-30 |
| FR2685484A1 (en) | 1993-06-25 |
| DE69210976T2 (en) | 1997-01-30 |
| FR2685484B1 (en) | 1995-09-08 |
| DE69210976D1 (en) | 1996-06-27 |
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